Locking bolt



y 1, 1934- c.. PAYNE LOCKING BOLT File d Oct. 5. 1952 Patented May 1, 1934 i I UNITED. STATES PATENT OFFICE LOCKING BOLT I Caleb Payne chicago, Ill. Application October 3, 1932, Serial No. 635,94ii 3 Claims. (01. 151-37) This invention relates to improvements in lockproximately equal to the thickness of the flange. ing bolts, and particularly to a one-piece bolt The bolt is preferably made of a suitable grade provided with. locking mean's'to prevent the bolt of spring steel so that there is a certain amount from "loosening, once it has been inserted and of resiliency in the flange and especially the pro- 5 screwed tightly in place. jections or prongs '6 as they may be called. The 60 The object of the invention is to provide a flange and therefore the prongs are of sufilcient bolt which will eliminate the necessity of a septhickness to give .them the required holding or arate locking member such as a lock washer of locking effect which is exerted whenthe bolt is any one of several types commonly used, and tightened down to its full extent.

thus avoid the additional operation of applying Assuming that the threads on the shank are 5 a Washer as Well as the Possibility of t g cut righthanded, the slots are cut so 'that'the the application of the same in the assembly of prongs trailduring the tightening of the bolt, that machines or machine parts. Such a bolt, thereis to say, if the bolt turns in a clockwise direction fore, is especially applicable to mass production when being screwed down, the prongs point in the methods in which the time alloted to each opera- 1 opposite direction. Thus when the prongs come. 70

tion is reduced to a minimum. v in contact with the-surface of the work being The novel features of the invention are applibolted, they are gradually sprung back toward 1 cable to all standard sizes and styles-of bolts, the plane of the flange as the head is drawn the more common type of bolt with a hexagonal against the surface when the bolt is tightened;

head being herein illustrated. Manifestly; if the bolt is subsequently rotated in '75 In the drawing, the opposite direction, the pointed prongs then Figure 1 s a p rsp ctive view of the bolt; function to lock it against turning 'by reason of Figure 2 is a View of the bolt'in side elevation, th ability of the sharp edges or pointed ends of with a portion shown in section; the prongs to bite into the surface of the worli Figure 3 is aview incross section taken on line against which the flange bears. In this man- 80 33 of Figure 2 ner any tendency for the bolts to loosen due to Fi 4 i a p p iv vi w' i nut ShOW- vibration or other forces which ordinarily cause ing the application of the same locking tea bolts and nuts to loosen, is counteracted, with the thereto. result that once inserted and screwed into place,

. In common with standard types of bolts, the' 1 1 1 11; W111 remain t g t improved locking bolt consists generally of a AS clearly shown in Figure 4, the same locking threaded f 1 and head Whlch m the feature may be incorporated ina nut 7,- such as mm a m'mes 2 a 1s hexagmali is intended tobe applied to a stud, the nut being whlch may be any standard shape- At tapped; fOl threading onto the stud'insteadof be- 35 g gfigi gi gf g g gg h gggg g g gf ing integral therewith to form the headoi a bolt.

crab formed b u sett the metal at the base Thus 1 1 has an mtegral flange 3 Wlth of in head, an manic which necessitates the tangentlally dlspwed M 9 m s t use of somewhat m metal in the blanking prongs 1-10 as before, which exert the same locking 4e eration than would be used in forming an 'ordi-' action whenfillmed down tly a ainst the work.

nary bolt. In other'words, the head is shaped Manifestly, o her arr n em nt of r illent to standard dimensions, and the flange made an prongs may be devised for producing the same integral extension thereof, although if desired, effective looking or holding action, and therefore m the flange may be the peripheral portion of a I d t h t be 1 it t any particular 45 disc fitted onto the shank and welded to the botplication of th invention r m0 tom of the headd I claim-as my invention: I

About the periphery of the flange are formed A work fastening member comprising a several slots 5 extending inwardly in a generally thrgfied Shank surmounted by a head having an tangential direction and toe. depth just short of integral flange extending radially from the base so the head. n this manner a ed tongue thereof, said flange having a slit extending inprojection Gis formed by the metal between each wardly from the edge thereof and oblique to a slot and t p yo h fl a a radialline through the entrance tothe slit, the these points is fupsetlor bent out of the plane rti of the fiange between the edge of th of the fla and'in a direction toward the shank flange and the 'slit being bent to form a resilient A 55 end of the bolt, the amount of upset being aP- prong extending in a. direction at right angles to said radial line with its end portion depressed below the underside of said flange.

2. A locking bolt comprising a threaded shank having a head provided with an integral annular flange at its base, said flange having slots extending inwardly from its periphery and thence substantially tangentially to the side faces of said head to form resilient prongs having their end portions bent to project below the underside of said flange and pointing in a direction to bite into the surface of the work when the head has been tightened to thereby resist the turning of the same in a direction to become loosened.

3. A locking bolt comprising a threaded shank having a head at one end and an annular flange formed integral with the lower edge thereof, said flange having slots cut to extend inwardly from the edge thereof and thence in a direction generally parallel with the edge of said flange, the portions of the flange between said slots and the edge of the flange being bent to form resilient prongs having their end portions normally depressed below the under side of the flange and in a direction to present their ends to the surface of the work so as to resist the turning of said head to loosen the same.

- CALEB PAYNE- 

